Access problem

Hello,


Hi i would like to access to my database source i am getting each time a message error can someone check whether i have made a mistake somewhere


JAR files has already been added


Construct an access object.
*/
public access ()
{
try
{
Context ctx = new InitialContext();
ds1 = (DataSource)ctx.lookup(dsName1); // Problem here

} catch (Exception e) {
e.printStackTrace();
}
}
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
at javax.naming.spi.NamingManager.getInitialContext(N amingManager.java:647)
at javax.naming.InitialContext.getDefaultInitCtx(Init ialContext.java:247)
at javax.naming.InitialContext.getURLOrDefaultInitCtx (InitialContext.java:284)
at javax.naming.InitialContext.lookup(InitialContext. java:351)
at access.<init>(access.java:19)
at access.main(access.java:58)
java.lang.NullPointerException
at access.performread(access.java:34

Configuration: Windows XP
Internet Explorer 6.0